here be dragons
短语此处有龙
释义与例句
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1.
A fanciful notation, commonly attributed to historical maps, held to indicate either the belief that unknown dangers exist in a certain location on the map, or that actual dragons can be found there.
此处有龙
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2.
By extension, used to indicate that which is unknown or uncertain, particularly if it seems to carry some type of risk.
. . . let me go into what was the unknown, ‘Here-be-Dragons’, hinterland of science, to find out what made scientists tick. . .
Speaking of money... here be dragons... Do you charge?
词源
Evidence of the use of this term as a notation on actual historical maps is lacking. The only known appearance of an equivalent phrase in any language on a historical map is of Latin HC SVNT DRACONES (“here are dragons”), placed on the east coast of Asia, on the Hunt-Lenox Globe, which dates from c. 1510. The phrase is simply a variation on HIC SVNT LEONES ("here are lions"), the classical phrase used by medieval cartographers to denote unknown territories on maps.
来源：wiktionary